Steam-engine



(Mmmm IH. W. PORSLUND.

STEAM ENGINE.

Patemed Peb. 4, 1896.

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Nirnn STATES IIUGO IV. FORSLUND, OF CHICAGO, ILLINOIS.

lSTEAM-ENeINE.

SPECIFICATION forming part of Letters Patent No. 554,022, dated February 4, 1896.

Serial No. 543,527. (No model.)

T0 all whom it may concern:

Be it known that I, HUGO W. FORSLUND, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Steam -Enginesg and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to that class of reversible engines which are used for operating hoisting apparatus. Its object is to reduce the consumption of steam when the hoistingcarriage is descending to the quantity needed to overcome the resistance of the machinery.

The invention consists of differentiated steam-supplies for the opposite direction of movement, and, further, of independent steam chest for the opposite direction of movement.

In the drawings, Figure l. is a longitudinal section through the cylinders and one of the steam-chests. Fig. 2 is a transverse section of the steam-chest through the reversingvalve. Fig. 3 is a similar view showing a modified form of valve and chest arrangement. Fig. a is a detail of a modified form of valve.

In operating elevating machinery by steampower difiiculty is found in running the engine in reverse direction-that is, so as to cause the elevator-cage to descend without being wasteful of steam. Ordinarily the weight of the the cage and the contents will carry it down without the use of steam. Sometimes power is required to start it on its downward movement, when its own revolution will keep it moving or is nearly sufficient for the purpose. The use of some steam is necessary, as engines have heretofore been constructed, otherwise the engines will be expected to work against a vacuum. It is not practicable to depend upon the operator to regulate the steam-service. The construction disclosed in this application provides for the adjustment of the steam-service for carrying down the elevator-cage to meet the requirements of the situation in which the engine is placed, relieving the operator of all responsibility and preventing an unsafe speed due to carelessness, and also the unnecessary expenditure of steam.

The drawings show a pair of twin cylinders A A, having the pistons a a set a h alf-stroke apart in the usual manner. The two cylinders are served by a steam-chest common to both, and each is provided with the usual ducts B B leading to its opposite ends. Each cylinder also has a steam-chamber O and a steam-chamber D, the latter being located between the ducts B B. All of these chambers and ducts open through the seat of a slide-valve E, which is so ported as to bring the ducts B B alternately into communication with thechambers C I).

Passages G G/ bring the chambers O D respectively into communication with the steam-chest F, and are controlled by a reversing or changing valve H, which covers ports g g/ leading to such passages. An eX- haust-port I is located between the ports g g', and is brought into co-operation with either o f the said ports by the valve I-I. Another steam-chest F' is also used and is independent of the chest F, though it may be located within it, as shown. The steam-chest F has a port f2 opening through the seat of the valve H and located near the port g', so that the valve may be shifted to open communication between these ports, the form of the valve being such that when it is so placed it also brings the port g into communication with the exhaust-port I.

The steam-chest F is served by a steampipe f of ample capacity to provide power to operate the engine to carry its full load, and hence to raise the elevator-cage. The valve II is shifted to open the passage G to the steam-chest F by uncovering the port g and opening the passage g to the exhaust I. The steam-chest F/ is served by a small steam-pipe f', which is controlled by a valve f3, by means of which its capacity may be still further reduced;

The initial application of power is the same when the cylinders are served by the chest F as when served by the chest F, as the pressure in the two chests is the same. As soon, however, as the expansion of the steam held IOO in reserve in the chest F'Y has been utilized the power is reduced to the capacity of the pipe f and as less power is required to keep the cage in motion than to start it the capacity of this pipe may be very limited, and consequently the consumption of steam during the descent of the Cage is very small.

The valve f3 should be permanently set after the machine has been completed and the amount of friction ascertained by test. After the machinery has been for some time in use, and consequently runs more smoothly than when new, it will be found that the amount of steam needed to lower the cage will be still less than at iirst and the valve may be readjusted.

The location of the steam-chest- F is immaterial. In Fig. 3 it is shown as embraced within the body of the valve lI and taking steam directly from the chest F. In this construction the face of the valve is changed somewhat in form, the port]cl2 leading through it and being adapted to register with the port g/ when communication is opened between the ports g and I. The valve has a stem h, by

means of which it is controlled by the opery The cylinder-valves E are automatiator. cally operated in the usual manner.

Vhile I prefer to use independent steamchests for the opposite directions of movement in order that the initial pressure for the downward movement may be greater than is subsequently maintained, it is obvious that any means by which the service through the passage G' is reduced to the needs of the descending load will come within the scope of the invention, and in Fig. l is shown a modified form of valve construction for producing this result, the service being directly from the main steam-chest F.

In Fig. -l an auxiliary port g2 is shown leading laterally from the port g" through the seat of the valve II. The valve f3 is set in and controls this auxiliary port and the valve H is adapted to uncover it to the steam-chest F while opening the port g to the exhaust-port I and covering the port g'. When the port g is opened to the pressure the port g' is opened to the exhaust-port I, the auxiliary port g' remaining covered.

Other means may be devised ior differentiating the steam-supply for the two directions of the engine, and I do not desire to be limited to the forms of construction shown.

I claim as my inventioni i l l r2. In a reversing rotative hoisting-engine permanently differentiated steam service passages tor the opposite movements of the engine.

3. In a reversing rotative hoisting-engine the combination with independent servicepassages foreach direction of rotation,of valve mechanism for controlling such passages and means for permanently adjusting the relative capacity of the passages.

l. In a reversing hoisting-engine the combination with independent service-passages foreach direction of movement, of a separate 1 steam-chest foreach passage, and valve mechanism for opening and closing such passages.

5. The combination with a reversible hoisting-engine ot' a separate steam-chest for serving the engine in each of its directions ot' rotation.

h'. In a reversible hoisting-engine, the combination with the cylinders, the steam-chest F, the passages G, G', the ports g, g', and the valve II, for covering said ports, oi' a steamchest F, having the eduction-port f2, and the induction-pipe f', the valve II, being adapted to bring the port 2, into communication with the passage G', substantially as described and tor the purpose set forth.

In a reversible hoisting-engine the combination with the cylinders, the steam-chest F, the steam-passages G, G', and the ports y, y", of the valve II, for covering said ports pacity for serving the engine when ruiming in opposite directions, et' a reversingvalve tor controlling such passages.

and having a body ehambered as at FQ an induction-pipe j", leading to the chest F, and an eduction-port leading from the chamber F', through the face of the valve and adapted to register with the port g.

In a reversible hoisting-engine the combination with the cylinders, the steam-chest F, the passa-ges G, G', and the ports g, g', oi' the valve II, for covering said ports and having a body chambered as at F', an inductionpipe j", leading from the chest F, to the chamber F, and an eduction-port f2, leading from the chamber F, through the face of the valve and adapted to register with the port g', and a valve f3, for controlling the pipe f'.

l). In a reversible rotative hoisting-engine the combination with the reversing-gear, of an independent steam-pipe for serving the engine in each of its directions of rotation and valves operatively connected with the reversing-gear for controlling such passages.

In testimony whereof I aiiix my signature in presence ot' two witnesses.

HUGO XV. FORSLUND. Witnesses:

torts K. GILLsoN, li. l. lARTHoLoMEw.

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